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Immergas Safety Thermostat / Overheat Cut-out Fault

Display shows 37, boiler may not start or may shut down unexpectedly

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Manual reset safety thermostat tripped, Faulty thermostat contacts, Wiring fault in safety chain

How to Fix / Troubleshooting

Safety: Allow the boiler to cool fully before attempting a reset.

Steps:

  • 1. Locate safety thermostat: On many Immergas models, a manual reset thermostat is mounted on the primary heat exchanger or flow pipe.
  • 2. Reset: Press the small reset button in the center of the thermostat (if present). You should feel a click.
  • 3. Investigate cause: Frequent tripping indicates overheating due to poor circulation, scale, or incorrect settings. Check pump operation, system pressure, and valves.
  • 4. Replace thermostat (technician): If it will not reset or has poor contact, replace with the correct Immergas spare.
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Repair Difficulty

Medium 3/5

Required Part

Safety Overheat Thermostat
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